QTR-Quadtone RIP

Hello, Terry. Thank you for you reply.

I've read that article and also checked other sources, including the
list archive, before posting here.

When I said "no color changes", I should have said "no shade changes". I
mean, my 50% gray is the same when I apply the profile during output or
when I print with no color management.

This is what is puzzling me. The HP laser printer profile works and
shows a distinct change, but all the profiles I've tried for the Epson
3800 make absolutely no changes no the printed image. The before and
after curves, generated with a spreadsheet, like you suggested, overlap.
For example: http://i.imgur.com/NBVPk.png <http://i.imgur.com/NBVPk.png>

The only reason I can think of is that this printer was already pretty
much linear before profiling. Does that make any sense? Am I overlooking
anything obvious?

Best,

Fabio Pili

--- In QuadtoneRIP@yahoogroups.com, Terry Ritz <t.ritz@...> wrote:
>
> Hi Fabio.
>
> I suggest you read through a great article that Keith Cooper wrote
called
> "Better black and white with the ColorMunki". Don't let the title fool
you.
> The article is all about using the QTR icc profile tool to linearize
your
> ABW black & white prints. Simply adjust the process as appropriate for
> Spider3Print.
>
>
http://www.northlight-images.co.uk/article_pages/bw_printing/bw_print_co\
lorm
> unki.html
>
> While I normally do my b/w printing using QTR itself and dedicated
> monochrome inks, I have used this approach to successfully linearize
Epson
> ABW output as well as Canon's equivalent on the 8300.
>
> BTW, if you have a spreadsheet you can use it to check your final
output and
> make sure it's linear. Make a step-wedge print using a profile you
created
> and then read the values. Graph these values in your spreadsheet,
taking
> care to set Dmax and Dmin as "0" and "100". You should get a straight
line
> with no bumps or curves.
>
> I'm not sure I fully understand your comment about seeing "no color
> changes". If you mean in your output, all that Create-ICC will do is
to make
> your print linear. It will not change the tone. You will have to use
ABW to
> do that. If you're talking about soft-proofing, drop your profile text
file
> onto "QTR-Create-ICC-RGB". This version of Create-ICC will use all
three Lab
> values and it will create a profile you can use to soft-proof the
"tone" or
> "color" of your b/w print. QTR-Create-ICC will create a profile that
will
> only show you luminosity values (i.e. no representation of paper or
ink
> color).
>
> Best,
>
> Terry.



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